 Kertanegara was a follower of a mystical Tantric syncretism of Hinduism and Buddhism, and presented himself as the divine god-king incarnation of Shiva and Buddha.Kertanegara celebrated many religious festivals and commissioned sculptures and metal plaques during his reign.Singhasari reached the height of its power during Kertanegara's rule, which saw the dramatic expansion of Javanese power into Sumatra, the Malay Peninsula, and Bali.